Federal prosecutors in Washington are not giving up trying to get back the $225,000 that the government contends it mistakenly paid to the producers of an IMAX film about dinosaurs that is playing at the Smithsonian Institution.

The U.S. Attorney’s Office for the District of Columbia in April sued Comet Distribution Ltd. to recoup the alleged overpayment. But the case hit a snag. For months, according to prosecutors, the government was unable to serve the necessary court papers to let the case move forward.

The hitch now appears resolved. U.S. District Judge Beryl Howell this month was preparing to dismiss the case for the prosecutors’ failure to find Comet’s agent to serve the suit.

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The suit against Comet alleges unjust enrichment stemming from the government’s mistaken extra payment for the licensing and exhibition of the dinosaurs film. The government claims it sent in mistake an extra $300,000 to Comet. Comet, according to the suit, returned $75,000.